The fetal heartbeat will appear when the HCG is around 10,000. The range of HCG values fluctuates greatly after early pregnancy, with regular menstrual cycles and an average of about 30 days, and the fetal heartbeat will appear at 6-7 weeks of menopause, mainly in relation to the number of days of menopause. If the HCG value is doubled and there is the growth of a gestational sac in the uterine cavity, and the fetal heartbeat appears as the number of days of menopause increases, it proves that the early embryo is developing well. Later on, as the gestational week extends, you can test regularly to see if it matches the ultrasound and to see how the embryo grows and develops. After the third month of pregnancy, the HCG value will stabilize at a higher normal level and will not rise again.